How does t-statistic differ from z-score? select one:

a) the t statistic computes the standard error by dividing the standard deviation by n - 1 instead of dividing by n.
b) the t statistic uses the sample mean in place of the population mean.
c) the t statistic uses the sample variance in place of the population variance.
d) all of these are differences between t and z.

Option c

Step-by-step explanation:

In Statistics, both t and z tests are used for testing of hypothesis.

Whenever we have sample sizes >30 and when we know population std deviation sigma, we use Z test.

i.e. if sigma is known, we check whether sample size >30 then we use z test

Otherwise if population std deviation is not known, we use t test.  

Even if population std deviation is known, if n <30 we use t test. Both use the same formula for std error.

Hence the correct option is option c.

  q

step-by-step explanation:

each line from a vertex to the midpoint of the opposite side is called a median. the point where the medians intersect, point q, is the centroid.

the centroid of δabc is point q.

sorry, i'm new here and i'm just trying to figure this out. try quizlet. rate 5* you!